AD587KQ Analog Devices Inc, AD587KQ Datasheet - Page 10

• Manufacturer Part Number: AD587KQ
• Manufacturer: Analog Devices Inc

Specifications of AD587KQ

• Fixed / Adjust / Prog: Precision
• Output Voltage (max): 10V
• Temperature Coefficient: 10ppm/°C
• Reference Voltage Accuracy (max): 5
• Line Regulation: 100uV/V
• Load Regulation: 100uV/mA
• Input Voltage (max): 36V
• Operating Temp Range: 0C to 70C
• Operating Temperature Classification: Commercial
• Mounting: Through Hole
• Pin Count: 8
• Package Type: CDIP
• Lead Free Status / Rohs Status: Not Compliant

AD587
APPLICATIONS INFORMATION
USING THE AD587 WITH CONVERTERS
The AD587 is an ideal reference for a variety of 8-bit, 12-bit,
14-bit, and 16-bit ADCs and DACs. Several examples follow.
10 V Reference with Multiplying CMOS DACs or ADCs
The AD587 is ideal for applications with 10-bit and 12-bit
multiplying CMOS DACs. In the standard hookup, shown in
Figure 19, the AD587 is paired with the AD7545 12-bit multi-
plying DAC and the AD711 high speed BiFET op amp. The
amplifier DAC configuration produces a unipolar 0 V to −10 V
output range. Bipolar output applications and other operating
details can be found in the individual product data sheets.
The AD587 can also be used as a precision reference for multi-
ple DACs. Figure 20 shows the AD587, the AD7628 dual DAC,
and the AD712 dual op amp hooked up for single-supply
operation to produce 0 V to −10 V outputs. Because both DACs
are on the same die and share a common reference and output
op amps, the DAC outputs will exhibit similar gain TCs.
Precision Current Source
The design of the AD587 allows it to be easily configured as a
current source. By choosing the control resistor R
the user can vary the load current from the quiescent current
(2 mA typically) to approximately 10 mA.
AD587
+15V
GND
AD587
V
V
+15V
GND
IN
OUT
V
V
TRIM
IN
OUT
Figure 20. AD587 as a 10 V Reference for a CMOS Dual DAC
Figure 19. Low Power 12-Bit CMOS DAC Application
INPUTS
DATA
0.1µF
10kΩ
0.1µF
V
V
REFA
REFB
18
V
DB11–DB0
AD7545K
REF
+15V
DB0
DB7
V
+15V
DD
DAC A
AD7628
DAC B
DGND
DGND
RFB A
R
AGND
FB
OUT1
R2
OUT A
RFB B
OUT B
AGND
C1
33pF
AD711K
+15V
–15V
AD712
0.1µF
0.1µF
C
in Figure 21,
0V TO –10V
V
0 TO –10V
V
0 TO –10V
OUT
OUT
V
OUT
A =
B =
Rev. G | Page 10 of 12
Precision High Current Supply
For higher currents, the AD587 can easily be connected to a
power PNP or power Darlington PNP device. The circuits in
Figure 22 and Figure 23 can deliver up to 4 A to the load. The
0.1 µF capacitor is required only if the load has a significant
capacitive component. If the load is purely resistive, improved
high frequency supply rejection results can be obtained by
removing the capacitor.
AD587
+V
IN
220Ω
AD587
+V
Figure 23. Precision High Current Voltage Source
+V
IN
2
4
220Ω
S
V
Figure 22. Precision High Current Source
AD587
OUT
+V
2
4
GND
Figure 21. Precision Current Source
+V
V
S
2
4
IN
V
IN
6
OUT
0.1µF
V
OUT
6
0.1µF
6
500Ω
MIN
R
C
2N6285
R
C
2N6285
I
L
=
V
+10V @ 4 AMPS
10V
OUT
R
C
+ I
I
L
BIAS
=
10V
R
C
+ I
BIAS